/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.pigpen.editor.commands;

import org.apache.pig.pigpen.editor.model.Operator;
import org.apache.pig.pigpen.editor.model.Query;
import org.eclipse.gef.commands.Command;

public class OperatorCreateCommand extends Command {
    private Query query;
    private Operator op;

    public OperatorCreateCommand(Operator op, Query query) {
        this.op = op;
        this.query = query;
    }

    public void execute() {

        if (!"".equals(op.getText())) {
            query.addOperator(op);
            op.reParse();
        }
    }

    public void undo() {
        if (op != null)
            query.removeOperator(op);
    }
}
